system.cc revision 11050
1/* 2 * Copyright (c) 2010-2013 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Copyright (c) 2002-2006 The Regents of The University of Michigan 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution; 24 * neither the name of the copyright holders nor the names of its 25 * contributors may be used to endorse or promote products derived from 26 * this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Ali Saidi 41 */ 42 43#include "arch/arm/linux/atag.hh" 44#include "arch/arm/linux/system.hh" 45#include "arch/arm/isa_traits.hh" 46#include "arch/arm/utility.hh" 47#include "arch/generic/linux/threadinfo.hh" 48#include "base/loader/dtb_object.hh" 49#include "base/loader/object_file.hh" 50#include "base/loader/symtab.hh" 51#include "cpu/base.hh" 52#include "cpu/pc_event.hh" 53#include "cpu/thread_context.hh" 54#include "debug/Loader.hh" 55#include "kern/linux/events.hh" 56#include "mem/fs_translating_port_proxy.hh" 57#include "mem/physical.hh" 58#include "sim/stat_control.hh" 59 60using namespace ArmISA; 61using namespace Linux; 62 63LinuxArmSystem::LinuxArmSystem(Params *p) 64 : GenericArmSystem(p), dumpStatsPCEvent(nullptr), 65 enableContextSwitchStatsDump(p->enable_context_switch_stats_dump), 66 taskFile(nullptr), kernelPanicEvent(nullptr), kernelOopsEvent(nullptr) 67{ 68 if (p->panic_on_panic) { 69 kernelPanicEvent = addKernelFuncEventOrPanic<PanicPCEvent>( 70 "panic", "Kernel panic in simulated kernel"); 71 } else { 72#ifndef NDEBUG 73 kernelPanicEvent = addKernelFuncEventOrPanic<BreakPCEvent>("panic"); 74#endif 75 } 76 77 if (p->panic_on_oops) { 78 kernelOopsEvent = addKernelFuncEventOrPanic<PanicPCEvent>( 79 "oops_exit", "Kernel oops in guest"); 80 } 81 82 // With ARM udelay() is #defined to __udelay 83 // newer kernels use __loop_udelay and __loop_const_udelay symbols 84 uDelaySkipEvent = addKernelFuncEvent<UDelayEvent>( 85 "__loop_udelay", "__udelay", 1000, 0); 86 if(!uDelaySkipEvent) 87 uDelaySkipEvent = addKernelFuncEventOrPanic<UDelayEvent>( 88 "__udelay", "__udelay", 1000, 0); 89 90 // constant arguments to udelay() have some precomputation done ahead of 91 // time. Constant comes from code. 92 constUDelaySkipEvent = addKernelFuncEvent<UDelayEvent>( 93 "__loop_const_udelay", "__const_udelay", 1000, 107374); 94 if(!constUDelaySkipEvent) 95 constUDelaySkipEvent = addKernelFuncEventOrPanic<UDelayEvent>( 96 "__const_udelay", "__const_udelay", 1000, 107374); 97 98} 99 100void 101LinuxArmSystem::initState() 102{ 103 // Moved from the constructor to here since it relies on the 104 // address map being resolved in the interconnect 105 106 // Call the initialisation of the super class 107 GenericArmSystem::initState(); 108 109 // Load symbols at physical address, we might not want 110 // to do this permanently, for but early bootup work 111 // it is helpful. 112 if (params()->early_kernel_symbols) { 113 kernel->loadGlobalSymbols(kernelSymtab, loadAddrMask); 114 kernel->loadGlobalSymbols(debugSymbolTable, loadAddrMask); 115 } 116 117 // Setup boot data structure 118 Addr addr = 0; 119 // Check if the kernel image has a symbol that tells us it supports 120 // device trees. 121 bool kernel_has_fdt_support = 122 kernelSymtab->findAddress("unflatten_device_tree", addr); 123 bool dtb_file_specified = params()->dtb_filename != ""; 124 125 if (kernel_has_fdt_support && dtb_file_specified) { 126 // Kernel supports flattened device tree and dtb file specified. 127 // Using Device Tree Blob to describe system configuration. 128 inform("Loading DTB file: %s at address %#x\n", params()->dtb_filename, 129 params()->atags_addr + loadAddrOffset); 130 131 ObjectFile *dtb_file = createObjectFile(params()->dtb_filename, true); 132 if (!dtb_file) { 133 fatal("couldn't load DTB file: %s\n", params()->dtb_filename); 134 } 135 136 DtbObject *_dtb_file = dynamic_cast<DtbObject*>(dtb_file); 137 138 if (_dtb_file) { 139 if (!_dtb_file->addBootCmdLine(params()->boot_osflags.c_str(), 140 params()->boot_osflags.size())) { 141 warn("couldn't append bootargs to DTB file: %s\n", 142 params()->dtb_filename); 143 } 144 } else { 145 warn("dtb_file cast failed; couldn't append bootargs " 146 "to DTB file: %s\n", params()->dtb_filename); 147 } 148 149 dtb_file->setTextBase(params()->atags_addr + loadAddrOffset); 150 dtb_file->loadSections(physProxy); 151 delete dtb_file; 152 } else { 153 // Using ATAGS 154 // Warn if the kernel supports FDT and we haven't specified one 155 if (kernel_has_fdt_support) { 156 assert(!dtb_file_specified); 157 warn("Kernel supports device tree, but no DTB file specified\n"); 158 } 159 // Warn if the kernel doesn't support FDT and we have specified one 160 if (dtb_file_specified) { 161 assert(!kernel_has_fdt_support); 162 warn("DTB file specified, but no device tree support in kernel\n"); 163 } 164 165 AtagCore ac; 166 ac.flags(1); // read-only 167 ac.pagesize(8192); 168 ac.rootdev(0); 169 170 AddrRangeList atagRanges = physmem.getConfAddrRanges(); 171 if (atagRanges.size() != 1) { 172 fatal("Expected a single ATAG memory entry but got %d\n", 173 atagRanges.size()); 174 } 175 AtagMem am; 176 am.memSize(atagRanges.begin()->size()); 177 am.memStart(atagRanges.begin()->start()); 178 179 AtagCmdline ad; 180 ad.cmdline(params()->boot_osflags); 181 182 DPRINTF(Loader, "boot command line %d bytes: %s\n", 183 ad.size() <<2, params()->boot_osflags.c_str()); 184 185 AtagNone an; 186 187 uint32_t size = ac.size() + am.size() + ad.size() + an.size(); 188 uint32_t offset = 0; 189 uint8_t *boot_data = new uint8_t[size << 2]; 190 191 offset += ac.copyOut(boot_data + offset); 192 offset += am.copyOut(boot_data + offset); 193 offset += ad.copyOut(boot_data + offset); 194 offset += an.copyOut(boot_data + offset); 195 196 DPRINTF(Loader, "Boot atags was %d bytes in total\n", size << 2); 197 DDUMP(Loader, boot_data, size << 2); 198 199 physProxy.writeBlob(params()->atags_addr + loadAddrOffset, boot_data, 200 size << 2); 201 202 delete[] boot_data; 203 } 204 205 // Kernel boot requirements to set up r0, r1 and r2 in ARMv7 206 for (int i = 0; i < threadContexts.size(); i++) { 207 threadContexts[i]->setIntReg(0, 0); 208 threadContexts[i]->setIntReg(1, params()->machine_type); 209 threadContexts[i]->setIntReg(2, params()->atags_addr + loadAddrOffset); 210 } 211} 212 213LinuxArmSystem::~LinuxArmSystem() 214{ 215 if (uDelaySkipEvent) 216 delete uDelaySkipEvent; 217 if (constUDelaySkipEvent) 218 delete constUDelaySkipEvent; 219 220 if (dumpStatsPCEvent) 221 delete dumpStatsPCEvent; 222} 223 224LinuxArmSystem * 225LinuxArmSystemParams::create() 226{ 227 return new LinuxArmSystem(this); 228} 229 230void 231LinuxArmSystem::startup() 232{ 233 if (enableContextSwitchStatsDump) { 234 dumpStatsPCEvent = addKernelFuncEvent<DumpStatsPCEvent>("__switch_to"); 235 if (!dumpStatsPCEvent) 236 panic("dumpStatsPCEvent not created!"); 237 238 std::string task_filename = "tasks.txt"; 239 taskFile = simout.create(name() + "." + task_filename); 240 241 for (int i = 0; i < _numContexts; i++) { 242 ThreadContext *tc = threadContexts[i]; 243 uint32_t pid = tc->getCpuPtr()->getPid(); 244 if (pid != BaseCPU::invldPid) { 245 mapPid(tc, pid); 246 tc->getCpuPtr()->taskId(taskMap[pid]); 247 } 248 } 249 } 250} 251 252void 253LinuxArmSystem::mapPid(ThreadContext *tc, uint32_t pid) 254{ 255 // Create a new unique identifier for this pid 256 std::map<uint32_t, uint32_t>::iterator itr = taskMap.find(pid); 257 if (itr == taskMap.end()) { 258 uint32_t map_size = taskMap.size(); 259 if (map_size > ContextSwitchTaskId::MaxNormalTaskId + 1) { 260 warn_once("Error out of identifiers for cache occupancy stats"); 261 taskMap[pid] = ContextSwitchTaskId::Unknown; 262 } else { 263 taskMap[pid] = map_size; 264 } 265 } 266} 267 268/** This function is called whenever the the kernel function 269 * "__switch_to" is called to change running tasks. 270 * 271 * r0 = task_struct of the previously running process 272 * r1 = task_info of the previously running process 273 * r2 = task_info of the next process to run 274 */ 275void 276DumpStatsPCEvent::process(ThreadContext *tc) 277{ 278 Linux::ThreadInfo ti(tc); 279 Addr task_descriptor = tc->readIntReg(2); 280 uint32_t pid = ti.curTaskPID(task_descriptor); 281 uint32_t tgid = ti.curTaskTGID(task_descriptor); 282 std::string next_task_str = ti.curTaskName(task_descriptor); 283 284 // Streamline treats pid == -1 as the kernel process. 285 // Also pid == 0 implies idle process (except during Linux boot) 286 int32_t mm = ti.curTaskMm(task_descriptor); 287 bool is_kernel = (mm == 0); 288 if (is_kernel && (pid != 0)) { 289 pid = -1; 290 tgid = -1; 291 next_task_str = "kernel"; 292 } 293 294 LinuxArmSystem* sys = dynamic_cast<LinuxArmSystem *>(tc->getSystemPtr()); 295 if (!sys) { 296 panic("System is not LinuxArmSystem while getting Linux process info!"); 297 } 298 std::map<uint32_t, uint32_t>& taskMap = sys->taskMap; 299 300 // Create a new unique identifier for this pid 301 sys->mapPid(tc, pid); 302 303 // Set cpu task id, output process info, and dump stats 304 tc->getCpuPtr()->taskId(taskMap[pid]); 305 tc->getCpuPtr()->setPid(pid); 306 307 std::ostream* taskFile = sys->taskFile; 308 309 // Task file is read by cache occupancy plotting script or 310 // Streamline conversion script. 311 ccprintf(*taskFile, 312 "tick=%lld %d cpu_id=%d next_pid=%d next_tgid=%d next_task=%s\n", 313 curTick(), taskMap[pid], tc->cpuId(), (int) pid, (int) tgid, 314 next_task_str); 315 taskFile->flush(); 316 317 // Dump and reset statistics 318 Stats::schedStatEvent(true, true, curTick(), 0); 319} 320 321